JPS5991191A - Drying and temperature raising of dry coke quenching equipment in early stage of operation - Google Patents

Abstract

PURPOSE:To increase the efficiency of operation, etc. in the drying and temperature raising of a newly built quenching tower, by forming a heat insulating layer consisting of sintered ore or iron ore in place of fire bricks laid on a cooling coke layer formed above a cooling gas blower. CONSTITUTION:A cooling coke layer 19 is formed to cover a cooling gas blower 12 at the bottom of a quenching tower 10 just before drying and temperature raising of a newly built coke oven and a heat insulating layer 20 consisting of sintered ore, iron ore, etc. is formed above the coke layer 19. A drying burner 17 is mounted on the heat insulatng layer 20 and air and fuel are sent in for combustion to dry and raise the temperature of the quenching tower 10. Then the drying burner 17 is removed and red-hot coke is charged into it through an inlet 11 while a cooling gas is blown into the tower from the cooling gas blower 12 to continue temperature raising, and the cooling coke layer 19 and the heat insulating layer 20 are taken out of the quenching tower.

Description

[Detailed Description of the Invention] This relates to a drying temperature raising method for dry fire extinguishing equipment, and in particular, it is charged to the bottom of the fire extinguishing tower before the start of drying to prevent the combustion of cold coke, which is charged to protect the cooling gas injection part. By changing the heat insulating layer to a bulk material that is processed in a blast furnace, which is different from the conventional one, we have ensured air permeability and also made it possible to put it into the blast furnace as it is without removing it after cutting, improving work efficiency. This paper relates to a method for increasing drying temperature in the initial stage of operation of coke dry extinguishing equipment that improves dry extinguishing equipment.

When a red-hot coke dry fire extinguishing tower is constructed, the refractory insulation material inside the tower is damp, so it is necessary to dry it and raise its temperature in the early stages of operation. To briefly explain this based on FIG. 1, before drying starts, a cold coke layer 3 is placed to cover the steel cooling gas blowing part 2 provided at the bottom of the fire extinguishing tower 1 in order to protect it from high temperatures. is formed in advance. Next, dry seeds 4
is installed in the tower, and while the air and fuel gas blown in from this are combusted, the combustion gas is exhausted through an annular flue 5 to dry the bricks in the tower. After the temperature has been raised by the tank 4, red hot coke is charged through the charging port 6 and the temperature is continued to rise using this heat.

By the way, there is a risk of combustion due to cold heat during drying, and it is necessary to prevent this.
Heat-resistant bricks were laid on the upper surface of this cold coke 3 to form a heat insulating layer 7.

However, although combustion of the cold coke 3 can be prevented by laying heat-resistant bricks, the following problems arise.

(1) When blowing cooling gas into the tower from the cooling gas blowing section 2 through the cooling gas conduit 8 in order to cool the charged red-hot coke, the air permeability of the heat insulating layer 7 made of the heat-resistant bricks is poor. As it is, we cannot send the necessary gas fish. Therefore, in order to form a fault in the heat-resistant brick layer in advance to serve as a gas passage, it is necessary to perform the troublesome work of cutting out a portion of the cold coke 3 from the bottom of the tower in different amounts in the circumferential direction.

(2) Although the heat-resistant bricks 7 are mixed into the coke cut from the lower part of the tower, if they are charged into the blast furnace together with the coke, it will cause operational problems because they are refractories. For this reason,
The complicated work of sorting out the mixed heat-resistant bricks 7 from the cut coke was completed.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to improve cooling and heating.

-By forming a layer of heat-resistant bulk material on top of the brick, it achieves the same insulation effect as the conventional heat-resistant brick layer, while also ensuring sufficient ventilation as it is, and the bulk material in the bracket is processed in a blast furnace. By treating the raw material with coke, it can be directly fed into the blast furnace together with the coke without having to be removed after it has been cut out, greatly improving work efficiency. There is a way to provide warmth.

According to the present invention, the above object is achieved as follows. That is, a cold coke layer is filled and formed so as to cover a cooling gas blowing section made of steel that is installed at the bottom of a fire extinguishing tower and blows cooling gas in countercurrent to the red-hot coke flowing down inside the tower. Protects the cooling gas blowing section from the high heat caused by the drying temperature increase that will occur in the future. Next, a heat insulating layer made of processing raw materials such as sintered ore, iron ore, etc., which are introduced into a blast furnace and processed together with the cold coke layer, is formed on the cold coke layer to ensure fire resistance and air permeability. Then, the upper part of the insulation layer...
Then, since air permeability has already been ensured, cooling gas is blown from the cooling gas blowing section through the cold coke layer and the heat insulating layer into the red hot coke that is charged into the tower. Finally, the cold coke layer and the heat insulating layer are cut out of the tower to be introduced into the blast furnace as they are mixed in without being separated later, since the heat insulating layer is the raw material to be processed in the blast furnace, thereby improving work efficiency. This is how it was done.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a schematic explanatory diagram showing an example of coke dry extinguishing equipment for explaining the method of the present invention.

As shown in the figure, 10 is a cooling tower having a charging port 11 at the top and a cooling gas blowing section 12 at the bottom; 13 is a dust remover; 14
15 represents a circulation fan, which introduces circulating gas into the cooling tower 10 and cools the red hot coke charged through the charging port 11 and flows down, and the circulating gas whose temperature has been raised by the cooling is sent to the cooling tower 10. 14 to form a circulating gas flow path for heat recovery.

Further, a diffusion pipe 16 is provided at a position on the gas inlet side of the cooling tower 10 in the circulating gas flow path.

In the figure, 17 is a drying nozzle 18 for drying the refractory insulation bricks in the cooling tower 10 by burning air and fuel gas.
indicates Dunno ξ, which is provided on the gas inlet side to the cooling tower 10 and controls the flow rate of the circulating gas or releases it to the diffusion pipe 16.

In the above configuration, before drying and heating the fire extinguishing tower 10, a cold coke layer 19 made of cold coke is filled and formed to cover the steel cooling gas blowing part 12 provided in advance at the lower part of the tower. A heat insulating layer 20 made of a processing raw material such as sinter or iron ore is laid on top of the cold coke layer 19 to prevent the cold coke layer 19 from being directly exposed to high temperatures.

Next, the drying and heating method of this fire extinguishing equipment will be explained.

After the coke dry fire extinguishing tower 10 is constructed, it is necessary to dry and heat the fireproof insulating bricks inside the tower 10 to remove moisture. This drying temperature increase is carried out in three stages at the beginning of operation in conjunction with the original red-hot coke cooling operation.

In the first stage of drying and heating up the coke dry extinguishing equipment, a temporary chimney 21 is installed at the charging port 11 at the top of the fire extinguishing tower 10, and the gas is circulated to the extinguishing tower 10 by closing the pipe ξ18 installed on the gas inlet side at the bottom. Prevent gas from flowing. Thereafter, a drying tank 17 is installed in the fire extinguishing tower 10, and the air and fuel gas sent therefrom are combusted, and the combustion gas is sucked in by the blower 18 and exhausted to the atmosphere through the diffusion pipe 16. Before the start of drying, as mentioned above, in order to protect the steel gas injection part 12 from the combustion heat of the nozzle 17 and the high heat of the red hot coke that will be charged later, cold heat made of cold coke is placed in the lower part of the fire extinguishing tower 10. Filling and forming the coke layer 19 into the gas blowing section 1
However, if this condition continues, there is a risk that the cold coke layer 19 will burn during the temperature rise. Therefore, in the present invention, a heat insulating layer 20 is formed on top of the cold coke layer 19 using bulk material made of blast furnace processed raw materials such as sinter or iron ore to protect the cold coke layer 19. Since sintered ore and iron ore are heat resistant, there is no danger of combustion, and if they are charged in layers, they have a heat insulating effect and can also prevent the cold coke layer 19 from burning.

As the second stage of drying temperature increase, as shown in Figure 3, drying and
The ζ-space 17 is removed, its manhole 22 (see FIG. 2) is closed, red-hot coke 23 is introduced from the charging port 11, and the temperature continues to rise using this heat. At this stage, the cylinder ξ 18 is opened to open a circulation gas flow path, and cooling gas is blown from the cooling gas blowing section 12 through the cold coke layer 19 and the heat insulating layer 20, and is caused to flow counter-currently to the red-hot coke 23 to exchange heat therewith. . At this time, since the heat insulating layer 20 of sintered ore or iron ore is made of loose material, it has good air permeability and does not interfere with the flow of the cooling gas.

In the final stage of drying and heating, coke 19 is gradually cut out from the bottom of the column 10, while red hot coke 23 is charged from charging 7-ro 11 at the top.

In this process, sintered ore or iron ore is mixed into coke 19, but since sintered ore and iron ore are raw materials for blast furnaces,
Even if they are charged together with coke into a blast furnace (not shown), there will be no problem in operating the horse furnace. Incidentally, in a 100Y class coke dry fire extinguishing equipment, the length of cold coke 19 is about 100 m, and the heat insulating layer 20 of sinter or iron ore used is 15 to 20 m.
Even if it is mixed with sintered ore or iron ore, the proportion thereof is small and does not pose any problem in blast furnace operation.

Therefore, a heat insulating layer 20 made of sinter or iron ore is formed on the top of the cold coke layer 19. Since this heat insulating layer 20 is a bulk material, it can be formed into a layer by simply charging it uniformly into the tower 10. Since the heat-resistant bricks 7 are laid on the upper surface of the cold coke layer 19, it is not necessary to lay the heat-resistant bricks 7 regularly as in the conventional example, and the work of forming the heat-insulating layer 20 can be made extremely easy and in a short time. In addition, since this heat insulating layer 20 is made of loose materials, it has countless gaps even when formed in layers, and as it has sufficient air permeability as it is, it is not possible to form ventilation paths using faults as in the past. It is possible to omit the secondary work of cutting out a portion of the coke for this purpose, and moreover, it is possible to send the required amount of gas. Furthermore, as a heat insulating layer 20,
Since we used sintered ore or iron ore itself, which is a processing raw material for blast furnaces, there is no problem even if it is fed into a blast furnace and processed, so it is possible to feed it into the blast furnace with the sintered ore mixed in. The most complicated work of removing the layer material (heat-resistant brick) from the coke can be omitted.

In summary, the method of increasing the drying temperature at the initial stage of operation of coke dry extinguishing equipment according to the present invention exhibits the following excellent effects.

(1) A heat insulating layer made of treated raw materials such as sintered ore and iron ore is formed on top of the cold coke, ensuring fire resistance 2 and breathability, and filling to protect the gas injection equipment from high temperatures. This prevents the formed cold coke layer from burning during drying and heating up, and when charging red hot coke and blowing cooling gas into the tower after the heating is completed by drying, it is sufficient as it is. Gas circulates and ventilation is unobstructed. Therefore, the work required to ensure air permeability, which was conventionally required, becomes unnecessary.

(2) Sintered ore or iron ore is mixed into the cut coke, but since these raw materials are blast furnace raw materials, they can be charged into the blast furnace together with the coke.

Therefore, the task of selecting coke from the coke, which was conventionally indispensable and most troublesome, can be omitted, and the initial operation time can be significantly shortened. Therefore, it becomes possible to smoothly raise the drying temperature, and accordingly, inexpensive blast furnace coke can be supplied.

(3) In this way, the entire operation process for drying and heating the fire extinguishing equipment can be simplified, and drying and heating can be done smoothly.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a fire extinguishing tower for explaining the conventional drying temperature raising method, and FIGS. 2 and 3 are schematic system diagrams of fire extinguishing equipment implementing the present invention. FIG. 3 is an explanatory diagram showing the drying temperature increase due to red hot coke. In addition, in the figure, 10Fi coke dry fire extinguishing tower, 12 is a cooling gas injection part, 17 is a nose, 19 is a cold coke layer, 2
0 is a heat insulating layer and 23 is red hot coke. Patent applicant: Patent attorney representing Ishikawajima-Harima Heavy Industries Co., Ltd.
Nobuo Kinuya

Claims (1)

[Claims] A cold coke layer is formed so as to cover the cooling gas blowing section which is installed at the bottom of the coke dry extinguishing tower and blows cooling gas in countercurrent to the red hot coke flowing down inside the tower. At the same time, a heat insulating layer is formed from processing raw materials such as sintered ore and iron ore which are put into a blast furnace for processing, and the upper part of the heat insulating layer is dried and heated using a nozzle, and then the above-mentioned A coke characterized in that the cold coke layer and the heat insulating layer are cut out of the tower while blowing cooling gas into the red hot coke introduced into the tower through the cold coke layer and the heat insulating layer from the cooling gas blowing part. Dry heating method at the initial stage of operation of dry fire extinguishing equipment.